The heat pipe code LERCHP has been revised, corrected, and extended. New features include provisions for pipes with curvature and bends in "G" fields. Heat pipe limits are examined in detail and limit envelopes are shown for some sodium and lithium-filled heat pipes. Refluxing heat pipes and gas-loaded or variable conductance heat pipes were not considered.Tower, Leonard K.Glenn Research CenterCODING; HEAT PIPES; CONDUCTIVE HEAT TRANSFER; MANUALS; STEADY STATE; SODIUM; PIPES (TUBES); LITHIUM; CURVATURE